The Style LVS_EX_GRIDLINES ensures the grid lines in the list item are displayed. But in Windos XP it does not work corectly, I have bypassed it.

from Q-Dir 3.84

Info:

The SystemParametersInfo SPI_SETLISTBOXSMOOTHSCROLLING calling the function to enable or to disable smooth scrolling in list-view controls and in list box controls.
But the SPI_GETLISTBOXSMOOTHSCROLLING does not work.